Articulating spacer

ABSTRACT

Spinal implants are disclosed. One spinal implant includes a support body, an articulating element, a blocking member and a motion limiting member. The support body includes a superior end surface and a lower end surface having teeth. In between the superior end surface and the lower end surface is a recess formed in a sidewall of the support body for receiving the articulating element. The blocking member can be received in the recess to prevent inadvertent back-out of the articulating element from within the recess. The articulating element can articulate in one or more directions, thereby allowing articulation of the spinal implant into a desired position within a disc space.

CROSS REFERENCE TO RELATED APPLICATIONS

This Patent Application is a continuation application of U.S. patentapplication Ser. No. 14/011,317, filed on Aug. 27, 2013, which is acontinuation application of U.S. patent application Ser. No. 13/109,754,filed on May 17, 2011, now U.S. Pat. No. 8,545,566, which is acontinuation-in-part application claiming priority to U.S. patentapplication Ser. No. 12/250,168, filed on Oct. 13, 2008, now U.S. Pat.No. 8,147,554, each of which are hereby incorporated by reference intheir entireties.

FIELD OF THE INVENTION

The present application generally relates to intervertebral spacers, andin particular, to articulating intervertebral spacers.

BACKGROUND OF THE INVENTION

The vertebrate spine is the axis of the skeleton providing structuralsupport for the other parts of the body. Adjacent vertebrae of the spineare supported by an intervertebral disc, which serves as a mechanicalcushion permitting controlled motion between vertebral segments of theaxial skeleton. The intervertebral disc is a unique structure comprisedof three components: the nucleus pulposus (“nucleus”), the annulusfibrosus (“annulus”) and two vertebral end plates.

The spinal disc can be displaced or damaged due to trauma, disease,degenerative defects or wear over an extended period of time. Forexample, disc herniation occurs when annulus fibers are weakened or tornand the inner tissue of the nucleus becomes permanently bulged. The massof a herniated or “slipped” nucleus tissue can compress a spinal nerve,resulting in leg pain, loss of muscle control, or even paralysis. Inaddition, in some cases, a degenerated nucleus can lose its waterbinding ability and deflate, thereby reducing the height of the nucleusand causing the annulus to buckle in certain areas.

To alleviate back pain caused by disc herniation or degeneration, thedisc can be removed and replaced by an implant that promotes fusion ofthe remaining bone anatomy. The implant, such as a spacer or cage body,should be sufficiently strong to support the spine under a wide range ofloading conditions. The implant should also be configured so that it islikely to remain in place once it has been positioned in the spine bythe surgeon. In addition, the implant should be capable of beingdelivered minimally invasively or at least through a relatively smallincision into a desired position.

Thus, there remains a need for an improved implant that addresses thesedifficulties.

SUMMARY OF THE INVENTION

Various embodiments of spinal implants are provided. In one embodiment,a spinal implant comprises a support body having a superior end surfaceand an inferior end surface, wherein each of the superior end surfaceand the inferior end surface include one or more teeth. The spinalimplant includes a side recess formed in the support body in between thesuperior end surface and the inferior end surface for receiving anarticulating element therethrough. In addition, the spinal implantincludes an articulating element positioned in the recess, wherein thearticulating element is configured to rotate along one or more axes.

In another embodiment, a spinal implant comprises a support body havinga superior end surface and an inferior end surface. The spinal implantincludes a side recess formed in the support body in between thesuperior end surface and the inferior end surface for receiving anarticulating element therethrough. The spinal implant further includesan articulating element sized for insertion through the recess andconfigured to rotate along one or more axes, as well as a blockingmember configured to be positioned within the recess for preventingback-out of the articulating element from within the recess.

In another embodiment, a spinal implant comprises a support body havinga superior end surface and an inferior end surface, wherein each of thesuperior end surface and the inferior end surface includes one or moreteeth, and wherein the support body includes a proximal end portion anda distal end portion having a tapered surface. A longitudinal openingcan be formed through the support body, wherein the longitudinal openingis configured to receive a bone graft material. A side recess is formedin the support body between the superior end surface and the inferiorend surface. The implant further comprises an articulating element sizedand shaped to be received in the recess, the articulating elementincluding an aperture with threads for receiving a portion of aninsertion tool and a groove on a top portion thereof. A blocking membercan be insertable through an aperture in the support body. The blockingmember can be configured to prevent unintentional back-out of thearticulating element from within the recess of the support body. Inaddition, a motion limiting member can be insertable through an aperturein the support body. The motion limiting member can be configured tocontact the groove of the articulating element and to preventover-articulation of the articulating element within the recess of thesupport body.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective exploded view of an implant according to someembodiments.

FIG. 2A is a perspective exploded view of an alternative implant havingan articulating element with a bumper element according to someembodiments.

FIG. 2B is a top view of the articulating element of the implant in FIG.2A.

FIG. 2C is a side perspective view of the articulating element of theimplant in FIG. 2A.

FIG. 2D is a cross-sectional view of the implant in FIG. 2A.

FIG. 3A is a perspective exploded view of an alternative implant havinga support body with a substantially flat side surface according to someembodiments.

FIG. 3B is a top view of the implant in FIG. 3A.

FIG. 3C is a top view of an articulating element of the implant in FIG.3A.

FIG. 3D is a side perspective view of the articulating element of theimplant in FIG. 3A.

FIG. 4 is a perspective exploded view of an alternative implant havingan articulating element with a substantially spherical body according tosome embodiments.

FIG. 5A is a perspective exploded view of an alternative implant havinga combined blocking element and motion limiting element according tosome embodiments.

FIG. 5B is a side perspective view of an articulating element of theimplant in FIG. 5A.

FIG. 5C is a different side perspective view of the articulating elementof the implant in FIG. 5A.

FIG. 5D is a cross-sectional view of the articulating element of theimplant in FIG. 5A.

FIG. 6 is a perspective exploded view of an alternative implant having asupport body with a built-in bumper element according to someembodiments.

FIG. 7 is a perspective exploded view of an alternative implant havingan articulating element configured to receive a retaining pin accordingto some embodiments.

FIGS. 8A-8D illustrate a method of inserting an implant in a disc spaceusing a delivery instrument according to some embodiments.

DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS

Detailed embodiments of the invention are disclosed herein; however, itis to be understood that the disclosed embodiments are merely exemplaryof the invention, which may be embodied in various forms. Therefore,specific structural and functional details disclosed herein are not tobe interpreted as limiting, but merely as a basis for the claims and asa representative basis for teaching one skilled in the art to variouslyemploy the present invention in virtually any appropriately detailedstructure.

The present application generally relates to implants such asintervertebral spacers, and in particular, to articulatingintervertebral spacers. The implants can be used to fuse together atreated area of the spine while restoring or maintaining the properspacing and natural curvature of the spine. The treated area can includeregions between adjacent vertebral bodies so that the height of theimplant corresponds approximately to the height of the disc.Advantageously, the improved implants described herein are configured toarticulate with ease into a desired position in between two vertebrae.In some embodiments, the improved implants can articulate along multipleaxes, thereby providing greater flexibility when positioning the spaceris a desired location. Novel features of the implants allow for moreefficient insertion or placement of the implants into a desired positionin between vertebrae.

FIG. 1 is a perspective exploded view of a spacer implant according tosome embodiments. The implant 10, which is configured to fit into a discspace in between two vertebrae, comprises a support body 14, anarticulating element 40, a blocking member 60, and a motion limitingmember 70.

The support body 14 of the implant 10 includes a superior end surface 35for contacting a superior vertebra and an inferior end surface 37 forcontacting an inferior vertebra. On the superior and/or inferior endsurfaces are one or more teeth 24 designed to contact the adjacentvertebrae and keep the support body 14 in a desired position. Alsoformed within the superior and/or inferior end surfaces are one or morelongitudinal openings 21. The one or more longitudinal openings 21 canbe formed through partly or completely through the implant 10, and areconfigured to receive bone graft or other natural and/or syntheticmaterial to facilitate bone growth when implanted. In addition, on thesuperior and/or inferior end surfaces are one or more apertures—aperture64 for receiving a blocking member 60 and aperture 68 for receiving amotion limiting member 70, which are discussed in more detail below.

In addition, the support body 14 includes a proximal end portion 16 anda distal end portion 18. As shown in FIG. 1, the distal end portion 18can have a tapered surface 20. In alternative embodiments, the proximalend portion 16 can have a tapered surface instead of or in addition tothe distal end portion. In some embodiments, when placing a support body14 in between vertebrae, the distal end portion 18 with the taperedsurface 20 can serve as the leading portion that is positioned in a discspace. Advantageously, the tapered surface 20 assists inself-distraction of vertebral bodies when the support body 14 isinserted in between vertebrae.

As shown in FIG. 1, the support body 14 also includes a side cut-outsection or recess 22 formed on a curved sidewall of the support body 14.The recess 22 defines a space that is configured to receive anarticulating element 40 therein. Compared to other spacer implants, inwhich articulating elements may be implanted through a portion of thesuperior end surface 35 and/or inferior end surface 37, the support body14 of the present application advantageously provides a side entrancefor the articulating element 40, thereby reducing the need to machine anaperture through the teeth 24. This advantageously preserves the numberof teeth and/or surface area covered by teeth and increases the abilityof the spacer to remain secure within a disc space.

During use, the articulating element 40 of the implant 10 can remain inthe recess 22 of the implant 10. The articulating element 40advantageously allows the support body 14 to be rotated in one or moreaxes (as shown in FIGS. 8A-8D), thereby allowing the support body 14 tobe in a proper orientation and location within a disc space. To preventthe articulating element 40 from falling out of the implant 10, ablocking member 60 can be provided, as discussed further below.

The articulating element 40 comprises an aperture 42, a pair ofsubstantially flat surfaces 45 and a groove 47 that extends along anupper portion of the articulating element 40. When the articulatingelement 40 is positioned within the recess 22 of the support body 14,the substantially flat surfaces 45 face inner walls of the support body14. In between the substantially flat surfaces 45 of the articulatingelement 40 is an aperture 42 for receiving a mateable portion of adelivery instrument 100 (as shown in FIGS. 8A-8D). In some embodiments,when the mateable portion of the delivery instrument 100 is attached tothe articulating element 40, the articulating element 40 allows thesupport body 14 to articulate or rotate relative to an axis of thedelivery instrument, thereby allowing the support body 14 to be placedin a desired position in a disc space, as shown in FIGS. 8A-8D. In someembodiments, the aperture 42 of the articulating element 40 includes aplurality of internal threads (not shown) that mate with externalthreads of a portion of a delivery instrument. Advantageously, thearticulating element 40 can articulate along one or more axes thatextend across the aperture 42 when the articulating element 40 ispositioned within the support body 14.

In some embodiments, the aperture 42 extends completely through adiameter of articulating element 40. In other embodiments, the aperture42 extends through only a portion of a diameter of the articulatingelement 40. In some embodiments, the articulating element 40 comprisestwo separate apertures 42 that are formed on opposite sides of thearticulating element 40.

A recess or groove 47 is formed along a portion of a top surface of thearticulating element 47. The groove 47 is configured to contact a motionlimiting member 70 that is received through the aperture 68. With themotion limiting member 70 in the groove 47, the articulating element 40can articulate, but will be prevented from over-articulating orover-rotating such that the aperture 42 will remain visible through theside recess 22 during a surgical procedure. In other words, the motionlimiting member 70 helps to prevent the articulating element 40 fromover-articulating to such a degree that the aperture 42 faces the insideof the support body 14 whereby it would be unable to receive a mateableportion of a delivery instrument 100. Advantageously, while the motionlimiting member 70 is in contact with the groove 47, the articulatingelement 40 can articulate through any angle up until the motion limitingmember 70 contacts the end surface 49 of the groove (shown in FIG. 1).As shown in FIG. 1, the motion limiting member 70 can be a smallcylindrical stump or peg that contacts the groove 47 of the articulatingelement, although it is not limited to this particular shape or size.For example, the motion limiting member 70 can be square or rectangularin shape.

To prevent the articulating element 40 from inadvertent back-out orremoval from the support body 14, a blocking member 60 can be placedthrough aperture 64 to block and secure the articulating element 40within the support body 14. The blocking member 60 can be insertedthrough an aperture 64 formed in the recess 22 of the support body 14.As shown in the illustrated embodiment, the blocking member 60 cancomprise a cylindrical peg, although it is not limited to this shape orsize. For example, in some embodiments, rather than be cylindrical inshape, the blocking member 60 can be rectangular in shape.

FIG. 2A is a perspective exploded view of an alternative implant havingan articulating element with a bumper element according to someembodiments. Like the prior illustrated embodiment, the implant 10includes a support body 14 having a side recess 22 for receiving anarticulating element 40, an articulating element 40 including anaperture 42, and a blocking member 60 to prevent inadvertent back-out ofthe articulating element from the support body. However, in the presentembodiment, the articulating element 40 includes a bumper element 84(shown in FIGS. 2B and 2C) that prevents over-articulation orover-rotation of the articulating element 40 instead of a separatemotion limiting member 70. Before the articulating element 40 isover-articulated or over-rotated, the bumper element 84 can contact aninner wall 25 within the support body 14 to prevent over-articulation.In some embodiments, the bumper element 84 sits in a groove or track 88(shown in FIG. 2D) that allows for limited articulation, therebyadvantageously preventing over-articulation.

FIGS. 2B and 2C illustrate a bumper element 84 positioned on a surfaceof the articulating element 40. In some embodiments, the bumper element84 comprises a protruding feature that extends from the surface of thearticulating element 40. As shown in FIG. 2C, the bumper element 84 canbe positioned near or adjacent the aperture 42. In other embodiments,the bumper element 84 can be positioned in other locations, such as awayfrom the aperture 42 in other locations along the circumference of thearticulating element. While the articulating element 40 in theillustrated embodiment includes a single bumper element 84, in otherembodiments, the articulating element 40 includes two or more bumperelements 84. For example, an articulating element 40 can include twoseparate bumper elements 84, one on each side of the aperture 42,thereby preventing over-articulation or over-rotation in one or moredirections. Furthermore, in some embodiments, the articulating element40 can include a bumper element 84, yet still work in conjunction with amotion limiting member 70 as shown in FIG. 1.

FIG. 3A is a perspective exploded view of an alternative implant havinga support body with a substantially flat side surface according to someembodiments. While the illustrated embodiment in FIG. 1 includes animplant 10 having a support body 14 with a recess 22 formed in a curvedsidewall, the implant 10 in FIG. 3A includes a recess 22 formed in asidewall that is substantially flat along at least a portion of thesidewall. The substantially flat portion of the sidewall 15 is visiblein the top view in FIG. 3B. With the substantially flat portion of thesidewall 15, the support body 14 in FIG. 3A assumes less of asickle-shape relative to the embodiment in FIG. 1. Advantageously, asurgeon can choose to use an implant 10 with a support body having acurved sidewall and sickle-shaped body as in FIG. 1, or an implant 10with a support body having a substantially flat sidewall as in FIG. 3A,thereby providing greater options for the surgeon to address differentbody shapes. The different shape of the support body in FIG. 3A providesa different axial footprint that can cover a greater surface areacompared to the support body in FIG. 1. In addition, the different shapealso provides a larger graft opening.

As shown in FIGS. 3C and 3D, the implant 10 can include an articulatingelement 40 having a bumper element 84 as discussed above. The bumperelement 84 can advantageously help to prevent over-articulation orover-rotation of the articulating element 40 within the support body 14having the substantially flat sidewall.

FIG. 4 is a perspective exploded view of an alternative implant havingan articulating element 44 with a substantially spherical body 49according to some embodiments. The articulating element 44 in FIG. 4 hasa more spherical shape with a rounder surface relative to thearticulating element 40 in FIG. 1. Advantageously, the substantiallyspherical body of the articulating element 44 in FIG. 4 provides forincreased articulation along one or more axes of rotation, therebyproviding more flexibility in the placement of the support body 14within a disc space. For example, in some embodiments, the articulatingelement 44 can move along a generally horizontal axis, as well as alongother axes that intersect the horizontal axis. Like the articulatingelement 40 in FIG. 1, the articulating element 44 in FIG. 4 can bepositioned in a recessed portion 22 formed within the support body 14.

FIG. 5A is a perspective exploded view of an alternative implant 10having a combined blocking and motion limiting element 63 according tosome embodiments. Like the illustrated implant in FIG. 1, thealternative implant 10 of FIG. 5A includes a support body 14 including aside recess 22 and an articulating element 40. In contrast, however, thealternative implant 10 includes a combined blocking and motion limitingelement 63 that functions to prevent both the inadvertent back-out ofthe articulating element 40 and over-articulation of the articulatingelement 40.

As shown in FIG. 5A, the combined blocking and motion limiting element63 includes a blocking post 67 that transitions into a motion limitingfeature 68. The blocking post 67 helps to prevent the inadvertentback-out of the articulating member 40 from within the support body 14.The motion limiting feature 68, which is configured as an extension fromthe blocking post 67, can rest on the groove 47 to preventover-articulation and/or over-rotation of the articulating element 40.The combined blocking and motion limiting element 63 can be deliveredthrough an aperture 65 formed through a superior and/or inferior surfaceof the support body 14, as shown in FIG. 5A. The aperture 65 can be of adifferent size and shape compared to apertures 64 and 68 (in FIG. 1) toaccommodate the features of the combined blocking and motion limitingelement 63.

In addition, the articulating element 44 in FIG. 5A includes distinctfeatures from the previously described articulating elements. Inparticular, in addition to having a substantially spherical body thatadvantageously provides for multi-axis articulation, the alternativearticulating element 44 also includes a top bump-out feature 61 and abottom bump-out feature 62 (shown in FIG. 5D). When the articulatingelement 44 is received in the recessed portion 22 of the support body14, the top bump-out feature 61 and the bottom bump-out feature 62 canbe received in one or more channels or grooves 27 formed within thesupport body 14. The grooves 27 advantageously allow for some rotationof the articulating element 44 along the longitudinal axis of thegrooves, thereby providing articulation in multiple directions. Inaddition, the grooves help to limit the amount of rotation along thelongitudinal axis of the grooves, thereby helping to preventover-articulation in that rotational direction.

FIGS. 5B-5D more clearly illustrate the specific features of thearticulating element 44, including the top bump-out feature 61 and thebottom bump-out feature 62. Of particular note is the cross-sectionalview in FIG. 5D, in which it is shown that the shape of the articulatingelement 44 (including the top bump-out feature 61 and the bottombump-out feature 62) generally conforms to a sphere, thereby allowingfor maximum possible articulation and rotation within the support body14.

FIG. 6 is a perspective exploded view of an alternative implant 10having a support body 14 with a built-in bumper element 71 according tosome embodiments. The built-in bumper element 71 can comprise aprotruding surface that extends from an inner wall of the support body14. In some embodiments, the built-in bumper element 71 helps to preventinadvertent back-out of the articulating element 40 in the support body14. As the bumper element 71 is built-in to the body of the support body14, apertures for receiving a blocking member need not be formed throughan end surface of the support body 14, thereby advantageously increasingthe number of teeth 24 and/or surface area of teeth for contacting avertebral surface.

FIG. 7 is a perspective exploded view of an alternative implant havingan articulating element configured to receive a retaining pin accordingto some embodiments. The articulating element 40 includes an aperture 42for receiving a portion of a delivery instrument, as well as an apertureor hole 72 formed therein for receiving a blocking member 60. When thearticulating element 40 is positioned in the support body 14 and theblocking member 60 is inserted therein, the blocking member 60 serves asan axis of rotation about which the articulating element rotates.

Each of the novel implants described above provides an articulatingelement that can be articulated in one or more axes. In someembodiments, the articulating elements can be articulated between about0 and 130 degrees, or between about 0 and 75 degrees along one or moreaxes.

Once a spacer implant is moved into a desired position betweenvertebrae, it is desirable for the implant to have sufficient structuralrigidity or integrity such that the implant does not buckle or otherwisefail under loading by the spine. The implant should be configured sothat it can sustain both axial compression and shear forces, as well astorsional forces. In some embodiments, the rigidity of the implantexceeds the rigidity of neighboring vertebral bodies to ensure that theimplant does not collapse or fail under loading conditions.

The height of the spacer implant can vary depending upon the height ofthe area of the spine that is to be treated. In some embodiments, avariety of implants having different heights can be provided, therebygiving a surgeon multiple options of which implant to use. In otherembodiments, the height of the implant can be adjusted within the discspace.

Any biocompatible material can be used to form all or part of a spacerimplant of the present application. Suitable materials can include, butare not limited to, titanium, stainless steel and/or other surgicalgrade metals and metal alloys. In addition, various polymers, such aspolyetheretherketone (PEEK), can also be used to form at least part ofthe spacer implant.

Methods of Use

The application encompasses a spacer implant having an articulatingelement that is loaded through a side cut-out section or recess of thespacer implant. The spacer implant can be implanted into a disc spacebetween two vertebrae.

Various instruments can be provided to deliver the spacer implant inbetween two vertebrae. For example, in some embodiments, a deliveryinstrument or insertion tool as described in U.S. patent applicationSer. No. 12/250,168 to Hansell et al., filed on Oct. 13, 2008 and herebyincorporated by reference in its entirety, can be used to deliver thespacer implant. The delivery instrument is capable of rigidly attachingto implant 10 and preventing rotation or articulation of the implant 10with respect to the delivery instrument axis. When a surgeon desires toallow the implant to articulate with respect to the delivery instrumentaxis, a portion of the implant 10 can disengage from the deliveryinstrument to selectively allow the implant to articulate via anarticulation element with respect to the delivery instrument axis. Theimplant can articulate to a desired position within a disc space,wherein it can be completely disengaged from the delivery instrument.

With reference to FIGS. 8A-8D, in some embodiments, the applicationencompasses methods for implantation comprising:

a. forming an incision in a patient;

b. attaching a spacer implant to a delivery instrument, wherein thespacer implant includes a superior end surface with teeth, an inferiorend surface with teeth, a side recess therebetween and an articulatingelement positioned within the side recess, wherein the spacer implant isrigidly attached and incapable of articulating with respect to thedelivery instrument axis;

c. delivering the delivery instrument and spacer implant through theincision to a disc space (FIG. 8A);

d. disengaging a portion of the spacer implant from the deliveryinstrument, thereby allowing the spacer implant with side recess toarticulate via the articulating element with respect to the deliveryinstrument axis (FIG. 8B);

e. rotating the spacer implant via the articulating element relative tothe delivery instrument until the spacer implant is in a desiredposition and orientation in a disc space (FIGS. 8C and 8D);

f. maintaining attachment of the spacer implant to at least a portion ofthe delivery instrument until the spacer implant is in the desiredposition; and

g. disengaging the spacer implant completely from the deliveryinstrument and leaving the spacer implant within the body of thepatient.

Any of the spacer implants 10 having side recesses for receiving anarticulating element as described with respect to FIGS. 1-7 can be usedwith the methods described herein.

It will be apparent to those skilled in the art that variousmodifications and variations can be made in the present inventionwithout departing from the scope or spirit of the invention. Moreover,the improved spacer implants and related methods of use need not featureall of the objects, advantages, features and aspects discussed above.Thus, for example, those skilled in the art will recognize that theinvention can be embodied or carried out in a manner that achieves oroptimizes one advantage or a group of advantages as taught hereinwithout necessarily achieving other objects or advantages as may betaught or suggested herein. In addition, while a number of variations ofthe invention have been shown and described in detail, othermodifications and methods of use, which are within the scope of thisinvention, will be readily apparent to those of skill in the art basedupon this disclosure. It is contemplated that various combinations orsubcombinations of these specific features and aspects of embodimentsmay be made and still fall within the scope of the invention.Accordingly, it should be understood that various features and aspectsof the disclosed embodiments can be combined with or substituted for oneanother in order to form varying modes of the discussed spacer implants.Thus, it is intended that the present invention cover the modificationsand variations of this invention provided that they come within thescope of the appended claims or their equivalents.

What is claimed is:
 1. A surgical system comprising: an implantcomprising: a support body, wherein the support body comprises aproximal end portion, a distal end portion, a first side surface thatextends between the proximal end portion and the distal end portion, anda second side surface that extends between the proximal end portion andthe distal end portion, wherein the first side surface is convexlycurved and the second side surface is concavely curved; a recess formedin the concavely curved second side surface; and an articulating elementreceived in the recess, wherein the articulating element comprises anaperture for receiving a portion of a delivery instrument therein; and adelivery instrument connectable to the articulating element via theaperture formed in the articulating element.
 2. The surgical system ofclaim 1, wherein the distal end portion comprises a tapered surface. 3.The surgical system of claim 1, wherein the support body comprises anupper surface and a lower surface, wherein the upper surface and thelower surface comprise teeth.
 4. The surgical system of claim 3, whereinthe distal end portion comprises a tooth-free zone.
 5. The surgicalsystem of claim 1, wherein the implant further comprises a blockingmember that is received in the recess.
 6. The surgical system of claim5, wherein the blocking member is received through the articulatingelement such that the blocking member serves as an axis of rotationabout which the articulating element rotates.
 7. The surgical system ofclaim 5, wherein the blocking member is cylindrical.
 8. The surgicalsystem of claim 5, wherein the blocking member extends through an uppersurface of the support body and a lower surface of the support body. 9.The surgical system of claim 8, wherein the blocking member furtherextends through the articulating element.
 10. The surgical system ofclaim 1, wherein the support body comprises an upper surface and a lowersurface, and a longitudinal opening that extends through the uppersurface and the lower surface.
 11. A surgical system comprising: animplant comprising: a support body, wherein the support body comprises aproximal end portion, a distal end portion, a first side surface thatextends between the proximal end portion and the distal end portion, anda second side surface that extends between the proximal end portion andthe distal end portion, wherein the first side surface is convexlycurved and the second side surface is concavely curved; a recess formedin the concavely curved second side surface; and an articulating elementreceived in the recess, wherein the articulating element comprises anaperture for receiving a portion of a delivery instrument therein; and adelivery instrument connectable to the articulating element via theaperture formed in the articulating element, wherein the deliveryinstrument comprises an inner shaft and an outer sleeve extending overthe inner shaft.
 12. The surgical system of claim 11, wherein the distalend portion comprises a tapered surface.
 13. The surgical system ofclaim 11, wherein the support body comprises an upper surface and alower surface, wherein the upper surface and the lower surface compriseteeth.
 14. The surgical system of claim 13, wherein the distal endportion comprises a tooth-free zone.
 15. The surgical system of claim11, wherein the implant further comprises a blocking member that isreceived in the recess.
 16. The surgical system of claim 15, wherein theblocking member is received through the articulating element such thatthe blocking member serves as an axis of rotation about which thearticulating element rotates.
 17. The surgical system of claim 15,wherein the blocking member is cylindrical.
 18. The surgical system ofclaim 15, wherein the blocking member extends through an upper surfaceof the support body and a lower surface of the support body.
 19. Thesurgical system of claim 18, wherein the blocking member further extendsthrough the articulating element.
 20. The surgical system of claim 11,wherein the support body comprises an upper surface and a lower surface,and a longitudinal opening that extends through the upper surface andthe lower surface.